Anything wrong with this??

Hmmm...walking around inside, no problem (assuming it's level). Crawling underneath...not so safe. I'd probably be even more concerned if they were the "kick down" style levelers. But in any case, hoses and seals can fail, so I wouldn't want to leave my rig like that for long without putting jack stands underneath it.

Like another poster, when I visit my brother, I have to do something similar (back tires on the ground, but front tires are way up) in his driveway to get near level.

~Rick